import './waves.css';

const context = '@@wavesContext';

function handleClick(el, binding) {
  function handle(e) {
    const customOpts = Object.assign({}, binding.value);
    const opts = Object.assign({
      ele: el, // 波纹作用元素
      type: 'hit', // hit 点击位置扩散 center中心点扩展
      color: 'rgba(0, 0, 0, 0.15)' // 波纹颜色
    },
    customOpts
    );
    const target = opts.ele;
    if (target) {
      target.style.position = 'relative';
      target.style.overflow = 'hidden';
      const rect = target.getBoundingClientRect();
      let ripple = target.querySelector('.waves-ripple');
      if (!ripple) {
        ripple = document.createElement('span');
        ripple.className = 'waves-ripple';
        ripple.style.height = ripple.style.width = Math.max(rect.width, rect.height) + 'px';
        target.appendChild(ripple);
      } else {
        ripple.className = 'waves-ripple';
      }
      switch (opts.type) {
        case 'center':
          ripple.style.top = rect.height / 2 - ripple.offsetHeight / 2 + 'px';
          ripple.style.left = rect.width / 2 - ripple.offsetWidth / 2 + 'px';
          break;
        default:
          ripple.style.top =
            (e.pageY - rect.top - ripple.offsetHeight / 2 - document.documentElement.scrollTop ||
              document.body.scrollTop) + 'px';
          ripple.style.left =
            (e.pageX - rect.left - ripple.offsetWidth / 2 - document.documentElement.scrollLeft ||
              document.body.scrollLeft) + 'px';
      }
      ripple.style.backgroundColor = opts.color;
      ripple.className = 'waves-ripple z-active';
      return false;
    }
  }

  if (!el[context]) {
    el[context] = {
      removeHandle: handle
    };
  } else {
    el[context].removeHandle = handle;
  }

  return handle;
}

export default {
  bind(el, binding) {
    el.addEventListener('click', handleClick(el, binding), false);
  },
  update(el, binding) {
    el.removeEventListener('click', el[context].removeHandle, false);
    el.addEventListener('click', handleClick(el, binding), false);
  },
  unbind(el) {
    el.removeEventListener('click', el[context].removeHandle, false);
    el[context] = null;
    delete el[context];
  }
};
